Kusunga Mapuratifomu Anopisa: Maitiro, Miganhu, uye Kuenzanisa Kudzoka

Kubatanidza mapurasitiki anopisa inzira inozivikanwa yekudzoreredza mabhodhi pamusoro pechidziro: unoisa solder paste, woisa zvikamu zvacho, wopisa bhodhi kubva pasi paplate inodzorwa nekupisa kusvika majoini anyunguduka uye aumbwa. Hazvidhuri, zvinokurumidza pabhodhi rimwe kana maviri, uye zvakanakira kugadzira maprototyping - asi zvine miganhu chaiyo inoita kuti ive chishandiso chisina kunaka chekugadzira. Gwaro iri rinotsanangura kuti kusanganisa mapurasitiki anopisa chii, maitiro ekuzviita nemazvo, kuti zvinoenzaniswa sei neovheni inodzoreredza, uye kuti unofanira kubva pabhenji uchienda kune nyanzvi paHighleap Electronics.

1. Chii chinonzi hot plate soldering?

Kusonerera plate inopisa inzira yekudzokorora kupisa PCB kubva pasi paplate yakati sandara, inodzorwa nekupisa kusvika solder paste yanyunguduka uye yagadzira jointi yega yega panguva imwe chete. Inoburitsazve kemikari yekuyerera kweovheni — paste inonyunguduka, flux inoshanda, kusimba kwenzvimbo kunodhonza zvikamu kuti zvienderane — asi zvinounza kupisa nekufambisa nepasi pebhodhi kwete nemhepo inopisa iri mukamuri.

Ichi chishandiso chinoshandiswa pakugadzira, chinozivikanwa nevagadziri, ma laboratori, uye zvitoro zvema prototype nekuti hot plate yakanaka inodzorwa haina mari yakawanda uye inopisa mumaminitsi mashoma. Maitiro acho akafanana nechero nzira yekusanganisa simbi , saka paste imwechete uye zvinangwa zvakafanana zvekupisa zvinoshanda. Chinhu chakakosha, chakaongororwa pazasi, ndechekuti kupisa kubva kune rumwe rutivi kunoshanda zvakanaka kune mamwe marudzi ebhodhi uye kwakaoma kuyera.

2. Maitiro ekusonesa PCB pahot plate (nhanho nenhanho)

Kuti uise chipunu chinodziya muplate, isa chipunu chinonyungudutsa pamapedhi, isa zvinhu zviri mupunu chinonyungudutsa, isa bhodhi paplate, wobva wadziisa, wonyika, wozodzoka kusvika majoini anyorova, wozotonhodza. Kutevera tembiricha pane kungopisa moto wakazara ndiko kunoita kuti majoini achene uye kuchengetedze zvikamu. Maitiro acho:

• Isa chirauro. Shandisa stencil kuti uwane zvinhu zvakaenzana, zvinodzokororwa, kana sirinji kuti uwane majoini mashoma; kunama zvakanyanya ndicho chikonzero chinowanzokonzera mabhiriji.
• Zvikamu zvenzvimbo mupunga wakanyorova, unobatirira, unoachengeta kusvika adzoka.
• Pfuura nepa profile. Pisa wonyika mvura kuitira kuti bhodhi rese nezvikamu zvidziye zvakaenzana, wobva waisa pamusoro penzvimbo inonyunguduka chirongo kuitira kuti majoini adzoke — tarisa kuti paste iri kupenya uye zvikamu zviri kugadzikana.
• Tonhorera zvinyoro nyoro uye tarisai kuti hapana mvura kana mabhiriji ari pasi pemvura.

Chekutanga, kunyungudutsa plate inopisa kunongopisa divi repasi chete, saka yakagadzirirwa kuiswa divi rimwe chete - kutenderedza bhodhi kuti uite divi rechipiri kunogona kudzoreredza zvikamu zvedivi rekutanga. Chechipiri, chitofu chekicheni hachisi chinotsiva plate inodzorwa nekupisa; kupisa kusingadzorwi kunodarika chimiro uye kunokuvadza zvikamu. Kune divi repaste re equation, misimboti yakakura yekusarudza nekubata paste yakafanana nechero mutsetse, uye kuverenga nekukurumidza maitiro epaste isina lead kunobatsira kana uchienzanisa paste neprofile.

3. Hot plate vs reflow oven: ndeipi yaunofanira kushandisa?

Shandisa plate inopisa yemhando dzakasiyana-siyana uye mapuranga ega ega, uye ovheni inodzokororwa yemapuranga ane mativi maviri, mhando inodzokororwa, uye chero huwandu. Musiyano mukuru ndewekuti kupisa kunoendeswa uye kudzorwa sei: plate inopisa inotungamira kupisa nepasi pebhodhi, nepo ovheni inodzokororwa ichikomberedza bhodhi rese neprofile inodzokororwa yemhepo inopisa inopisa mativi ese nechikamu chimwe nechimwe zvakaenzana.

Kune mugadziri anosimbisa marongerwo echinhu, hot plate yakakwana. Kana uchida majoini akafanana, akanyorwa pamapuranga akawanda, mativi ese ari maviri akazadzwa, kana zvikamu zveBGA zvinoda chimiro chakakodzera, ovheni yekudzoreredza mvura ndiyo chishandiso chakakodzera - uye musiyano uripo pakati penzira mbiri idzi zvakare inyanzvi inobatsira pakudzoreredza mvura kana kutenderedza mafungu pachikero chekugadzira.

4. Kana ndiro inopisa isiriyo chishandiso chisiri icho

Piritsi rinopisa harisi chishandiso chakakodzera mabhodhi ane mativi maviri, BGA uye zvikamu zvinogumira pasi, mabhodhi makuru kana makobvu, uye chero chinhu chinoda kudzokororwa uye chakanyorwa mhando. Muganho wega wega unobva pamudzi mumwe chete - kupisa kunopinda kubva kune rumwe rutivi uye zvakaoma kudzora nemazvo:

• Gungano rine mativi maviri — kupisa kubva pasi kunodzosa mvura kurutivi rwepasi, saka haugone kuita mativi ese ari maviri zvakanaka.
• BGA uye majoini akavanzwa — izvi zvinoda kuongororwa kwakaenzana, kwakarongwa uye X-ray, izvo zvisingagone kupihwa nehot plate.
• Mabhodhi makuru kana kuti makobvu — dzinopisa zvisina kuenzana mundiro, zvichisiya makona anotonhora uye nzvimbo dzakabikwa zvakanyanya.
• Hunhu hunodzokororwa — kuvimbika kwekugadzirwa kunoenderana neprofile inodzorwa, yakanyorwa pabhodhi rega rega, kwete kutonga kwevamiriri.

Kusunda hot plate kupfuura miganhu iyi ndiko uko maitiro eprototype anoshanduka kuita matambudziko ekukohwa, nenzira imwecheteyo matambudziko mazhinji ekugadzira anongoonekwa chete kana dhizaini yabuda. Kugadzirisa hakusi hot plate yakakura; ndiyo nzira chaiyo.

5. Kudzokorora tembiricha: chikamu chinotanga chinodarika

Kuchinja-chinja kwemvura (reflow profile) kune matanho mana — preheat, soak, reflow, uye cooling — uye kuitevera ndiko kunoparadzanisa majoini akachena kubva kune akakuvara, kungave uchichinja-chinja pahot plate kana muovheni. Chikanganiso chinowanzoitika kune vanotanga ndechekusvetuka kuchinjika kwemvura (beginner profile) wobva wawedzera kupisa kusvika pakakwirira, izvo zvinopisa zvikamu, zvinopisa flux isati yashanda, uye zvinogadzira majoini anotonhora kana akatsemuka. Danho rega rega rine chinangwa:

• Preheat inokwidza bhodhi nedanho rakarongwa (kazhinji madhigirii mashoma pasekondi) kuderedza kupisa uye kutanga kuvhura flux.
• soak inochengetedza tembiricha yepakati yakagadzikana kuitira kuti bhodhi rese nezvinhu zvese zvinosvika patembiricha yakaenzana uye kuyerera kunochenesa zvizere nzvimbo dzisati dzanyunguduka.
• reflow inotora majoini pamusoro penzvimbo yekunyunguduka kwealloy — inenge 217–227°C kuti pave nemapastes asina lead — kwenguva pfupi saka solder inobatana yonyorova, yozodzokera pasi.
• kutonhora inodzikisa bhodhi pasi nedanho rakadzorwa kuti igadzire chimiro chakasimba chezviyo zvekubatana pasina kupisa zvikamu.

Pachitofu chinopisa unofunga izvi nekuisa plate panzvimbo yakatsetseka wotarisa bhodhi, iyo inoshanda kumabhodhi ari nyore ane mativi maviri asi haina kunyatsojeka. Ovheni inoyererazve inochengetedza danho rega rega munzvimbo dzakasiyana dzinopisa saka zvikamu zvikuru nezvidiki zvese zvinosvika patembiricha yakakodzera - kudzokorora uko kuyererazve kwebench hakugone kuenzana, uye chikonzero nei paste imwechete ichiita zvakasiyana pamutsetse wakadzorwa. Kuenzanisa paste neprofile kunotanga ne alloy, saka kutarisa maitiro ekunyungudutsa solder asina lead kwakakosha usati waisa tembiricha.

6. Nguva yekuchinja kubva pakupisa ndiro kuenda pakugadzira zvakare

Chinja kubva pakupisa kuenda pakugadzira zvakare kana wangoda mabhodhi anopfuura maviri, mativi ese akazadzwa, zvikamu zveBGA kana fine-pitch, kana majoini akasimbiswa, anogona kudzokororwa. Ndipo panotanga kudzima nguva yekuchengeta bench reflow, uye hunyanzvi hunobhadhara.

Highleap inotora dhizaini kubva padanho iroro reprototype kuita vhoriyamu yakavimbika kuburikidza neSMT PCB assembly ine profiled reflow, AOI, uye X-ray yemajoini akavanzwa - saka majoini awakatarisa pahot plate ikozvino akavakwa kuita profile inodzorwa uye yakasimbiswa. Kutanga nekusimbisa marongerwo acho neprototype PCB run kunoita kuti shanduko ive nyore. Paunokumbira mutengo, taura kana bhodhi iri rakasiyana kana kuti rakasiyana, pitch diki kana chero BGAs, uye huwandu hwako kuitira kuti maitiro akakodzera ashandiswe.

7. Mibvunzo Inowanzo bvunzwa Nezvekuputira ndiro inopisa

Unogona kushandisa hot plate yekicheni kana skillet kusanganisa PCB here?

Hazvina njodzi uye hazvikurudzirwi. Chitofu chekicheni hachina tembiricha yakanaka, saka chinodarika chimiro chacho uye chinokuvadza zvikamu, uye ndiro dzechikafu hadzina kuenzana. Chitofu chinonyungudutswa chakagadzirwa nechinangwa chakagadziriswa hachina mutengo wakaderera uye chakachengeteka zvikuru.

Tembiricha ipi inofanira kuiswa pahot plate yekusonesa?

Ndiro inofanira kuunza majoini pamusoro penzvimbo yekunyunguduka kwesolder — inenge 217–227°C kuti paste isina mutobvu ishande — asi unokwira nekudziya usati wapisa wonyorova pane kuisa peak iyoyo kubva kuchando. Pamusoro pendiro kazhinji panopisa zvishoma kupfuura tembiricha yejoini.

Unogona here kudzoreredza machipisi eBGA pahot plate?

Hazvina kunyatsovimbika. MaBGA anoda kudziya kubva kumusoro nepasi uye kuongororwa kweX-ray kuti aone kana paine mabhora akavanzika, ayo hapana kana imwe yeaya anopa hot plate inodziya pasi. Basa reBGA rinofanira kuitwa paovheni inodzokororwa kana panzvimbo chaiyo yekugadzirisa.

Unoda solder paste here kuti uise hot plate soldering?

Ehe — hot plate reflow inonyungudutsa solder paste yakamboshandiswa, saka paste (kana yakadhindwa nestencil) inokosha. Haugone kuifambisa ne solder waya, iyo yakagadzirirwa kusanganisa simbi pamajoini ega ega.

Ko hot plate inogona kubvisa kana kugadzirisazve zvikamu zvekuisa pamusoro pechinhu here?

Ehe kune chikamu chepasi — kupisa bhodhi kunodzoreredza majoini kuitira kuti zvikamu zvikwanise kusimudzwa, izvo zvinobatsira pakuchengetedza kana kugadzirisa zvikamu zveSMD. Hazvidzoreki zvakanyanya kupfuura mhepo inopisa pakubvisa chikamu chimwe chete pakati pezvakawanda.

Sei majoini angu ehot plate asina kusimba kana kuti asinganyungudike zvakaenzana?

Kazhinji kubatana kweplate kusina kuenzana, bhodhi rakakura zvakanyanya kana kuti gobvu, kana tembiricha isina kukwana. Bhodhi rakati sandara rakabatikana zvizere, bhodhi rakakura zvakaenzana, uye kunyorova zvakakwana kuitira kuti kupisa kupararire zvakaenzana zvese zvinovandudza mhedzisiro.